package main

import "fmt"

func main() {
	var score = 98
	var result string
	switch score / 10 {
	case 9, 10:
		result = "优秀"
	case 8:
		result = "良好"
	case 7, 6:
		result = "及格"
	default:
		result = "不及格"
	}
	fmt.Println(result)
}
